high 7.1

CVE-2025-39685 json

comedi: pcl726: Prevent invalid irq number

published 2025-09-05 14 mo ago modified 2026-10-19 20 d ago also EUVD-2025-31539

cvss: 7.1; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 6%
public exploits: 0; none known

In the Linux kernel, the following vulnerability has been resolved:

The reproducer passed in an irq number(0x80008000) that was too large, which triggered the oob.

Added an interrupt number check to prevent users from passing in an irq number that was too large.

If `it->options[1]` is 31, then `1 << it->options[1]` is still invalid because it shifts a 1-bit into the sign bit (which is UB in C). Possible solutions include reducing the upper bound on the `it->options[1]` value to 30 or lower, or using `1U << it->options[1]`.

The old code would just not attempt to request the IRQ if the `options[1]` value were invalid. And it would still configure the device without interrupts even if the call to `request_irq` returned an error. So it would be better to combine this test with the test below.

Patch / fix

fixed in 2 distros 5 links 6

Linux Linux 5.15.190, 6.1.149, 6.6.103, 6.12.44, 6.16.4, 6.17
Siemens SIMATIC CN 4100 V5.0

debian ubuntu suse opensuse azure linux

linux Debian 12 6.1.153-1
linux Debian 13 6.12.48-1
linux Debian 14 6.16.5-1

debian advisories DEBIAN-CVE-2025-39685

linux Ubuntu 22.04 LTS 5.15.0-163.173
linux Ubuntu 24.04 LTS 6.8.0-100.100
linux-aws Ubuntu 22.04 LTS 5.15.0-1097.104
linux-aws Ubuntu 24.04 LTS 6.8.0-1046.49
linux-gcp Ubuntu 22.04 LTS 5.15.0-1097.106
linux-gcp Ubuntu 24.04 LTS 6.8.0-1047.50
linux-gke Ubuntu 22.04 LTS 5.15.0-1093.99
linux-gke Ubuntu 24.04 LTS 6.8.0-1043.48

ubuntu advisories UBUNTU-CVE-2025-39685

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

kernel-rt Linux Micro 6.2 6.12.0-160000.6.1
kernel-64kb SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
kernel-source SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
kernel-default SLES 16.0, SLE High Availability Extension 16.0, Linux Micro 6.2 +1 more 6.12.0-160000.6.1
kernel-default-base SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1.160000.2.4
kernel-syms SLES 16.0, Linux Micro Extras 6.2, SLES for SAP applications 16.0 6.12.0-160000.6.1
kernel-obs-qa SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.6.1
kernel-kvmsmall SLES for SAP applications 16.0, SLES 16.0 6.12.0-160000.6.1

suse advisories SUSE-SU-2025:21074-1 SUSE-SU-2025:21139-1 SUSE-SU-2026:20560-1 SUSE-SU-2025:21179-1 SUSE-SU-2025:4141-1 SUSE-SU-2025:4132-1

kernel-rt openSUSE Leap 16.0 6.12.0-160000.6.1
dtb-aarch64 openSUSE Leap 16.0 6.12.0-160000.6.1
kernel-64kb openSUSE Leap 16.0 6.12.0-160000.6.1
kernel-syms openSUSE Leap 16.0 6.12.0-160000.6.1
kernel-obs-qa openSUSE Leap 16.0 6.12.0-160000.6.1
kernel-source openSUSE Leap 16.0 6.12.0-160000.6.1
kernel-default openSUSE Leap 16.0 6.12.0-160000.6.1
kernel-kvmsmall openSUSE Leap 16.0 6.12.0-160000.6.1

opensuse advisories openSUSE-SU-2025:20081-1

kernel Azure Linux 3.0 6.6.104.2-1

azure linux advisories AZL-66935

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2025-39685 updated 2026-11-06

kernel: comedi: pcl726: Prevent invalid irq number

Red Hat Enterprise Linux 6 perf, kernel, python-perf, kernel-kdump, kernel-firmware, kernel-bootwrapper, +1 more Red Hat Enterprise Linux 7 perf, kernel, bpftool, kernel-rt, python-perf, kernel-kdump, +8 more Red Hat Enterprise Linux 8 perf, kernel, bpftool, kernel-rt, kernel-core, kernel-tools, +29 more Red Hat Enterprise Linux 9 rv, perf, rtla, kernel, bpftool, libperf, +83 more Red Hat Enterprise Linux 10 kernel
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-26-134-10 updated 2026-05-14 cvss 5.5

Siemens SIMATIC

Siemens SIMATIC CN 4100 < 5.0
affected: fixed in V5.0 support.industry.siemens.com

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

0.17% chance of exploitation in the next 30 days, higher than 6% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
NVD	3.1	7.1	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

Linux Linux
Siemens SIMATIC CN 4100

Classification

Weakness

CWE-125 Out-of-bounds Read

Technology feeds

Linux kernel rss critical rss

References

Sources

CVE List CVE-2025-39685
NVD CVE-2025-39685

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary